The recent progress in sol-gel preparation of nano WO3 materials, their gasochromic mechanism and applications are expatiated in this review. The influence of sol-gel conditions such as hybrid, templatig agent, solvent and calcination temperature, etc. on the structures and properties of such materials, is comment with emphasis. Finally, the prospect of the research and application of nano WO3 gasochromic materials is also forseen. We believe that the key points of the future study on nano WO3 materials prepared by sol-gel process will be how to optimize the design and selection of efficient doping materials and templates, and how to reduce the temperature of gas detection and find the real gasochromic mechanism.